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3+3=1+-r
We move all terms to the left:
3+3-(1+-r)=0
We add all the numbers together, and all the variables
-(-1r)+3+3=0
We add all the numbers together, and all the variables
-(-1r)+6=0
We get rid of parentheses
1r+6=0
We add all the numbers together, and all the variables
r+6=0
We move all terms containing r to the left, all other terms to the right
r=-6
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